First of all, I want to ask the moderator of the community forum, I have attempted to create a few posts over the past two weeks to seek help with a missing product in my order. However, either the system said I exceeded limit (not idea what limit it is referring to), or it is subject to review. And till now those post under review never get approved. I had one post that I made successfully but was being forcefully deleted within 30 minutes after creation; no one explained me why it is deleted. I can’t help thinking this was an attempt to hide the poor order processing issues by Dyson.

The problem I was having:
I ordered a Dyson V8 Advanced and a Dyson Purifier Humidify+Cool PH04 Formaldehyde in a single order on 21st Nov 2024 when black Friday sales was up.

On the next day I received an email notification from Parcel Force saying that this order with Dyson comprised of 2 items will be delivered on 23rd Nov 2024.
On 23rd Nov 2024 I received the Dyson V8 Advanced which on the box label stated item 1 of 2. The Dyson Purifier Humidify+Cool PH04 Formaldehyde was not delivered together.

My interaction with Dyson’s customer service support.
I was concerned about the missing Dyson Purifier Humidify+Cool PH04 Formaldehyde and immediately reach out to Dyson’s web support chat on 23rd Nov 2024. The support chat agent got my details and order number, then told me that the Dyson Purifier Humidify+Cool PH04 Formaldehyde will be delivered in the following week and told me not to worry. 
Throughout the next 3 weeks I contacted web support chat more than 8 times, each time someone assured the problem would be solved within 48 - 72 hours, and every time was an empty promise. And I had to call back and repeat all over regarding the issue from the beginning. It was time consuming and frustrating. (If you prefer to use the web support chat, remember to save the transcript every time and request a case number before ending the conversation). I asked the support agent to check the Parcel Force (Dyson’s logistic partner) tracking and that it clearly shown in the delivery proof picture only one item was delivered, and they acknowledge that the only has evidence of the V8 being delivered on 23rd Nov, but not the PH04. The last time I was talking to the web support chat agent was 14th December 2024. And basically, the agent told me as far as Dyson concern, their system shown that the delivery status in complete, and the agent told me if I want a refund, I should go to my bank for a charge back. In short, they don’t give a damn about the missing product or the customer (I really want to share to you all the screenshot of their exact wordings, but I guess they would not allow the post to go through again)
Then I decide to call the hotline and hoping someone from the hotline team would be more sensible. Similar pattern every time I called, they told me they will escalate the case and wait 48-72 hours, yet every time they asked me to check my Neighbours despite the fact that they know the PH04 wasn’t delivered by Parcel Force at all.

Finally, on 22nd December, I decided to call Parcel Force and asked them about the delivery on 23rd Nov. I told them, I have clear CCTV footage showing the delivery man only brought one product with him, and Dyson was telling me that both have been delivered. I told them things were not adding up, then Parcel Force themselves confirmed with me that only the V8 was delivered, and the PH04 they may have lost it. I called Dyson hotline one last time, telling them that I have not yet hear back from them, so I called Parcel Force and Parcel force confirmed the PH04 was lost.

Then I tell the Dyson hotline agent that it has been more than 30 days since I placed the order and requested a redelivery of the missing product, and this would be a clear breach of Consumer Right Acts 2015. i told the agent if they don’t give me an update about a delivery schedule or refund the next day, then I will escalate the case to Trading Standard via Citizens Advice. Within an hour after this statement, Dyson call me back for the first time and then apologize for losing the original item and they will arrange a re-delivery immediately.

Anyhow, the missing product finally got delivered on 27th December.
After all the struggle I had to been through to get what I have order, I probably would not order from Dyson online store again. 
I have been reading the forums and see that there are frequent cases about missing item. Not to mention how many of the posts that were never approved and not make it to the lights. 
For all you out there still struggling: Consumer Right Acts 2015, Trading Standard and Citizens Advice are your keywords when dealing with Dyson customer service.
For those who are considering ordering from Dyson online store, I believe you would be much better off just buy it from retailers like Currys and Agros (I saw post about Agros selling used Dyson).
It is a shame to see that Dyson has great product designs, but order processing and customer service are so chaotic.
I would seriously look for substitutes and think twice before I buy Dyson again.